Newscoop\Entity\Publication::getSections PHP Method

    public function getSections()
    {
        $added = array();
        $sections = array();
        foreach ($this->issues as $issue) {
            foreach ($issue->getSections() as $section) {
                if (in_array($section->getNumber(), $added)) {
                    // @todo handle within repository
                    continue;
                }
                $sections[] = $section;
                $added[] = $section->getNumber();
            }
        }
        return $sections;
    }